Thanks for the suggestion. I looked at Godot ages back, not sure why I passed on it in favour of Unity. I think I had different goals back then. I will definitely have another look at it before the next jam I participate in.

I'm trying out HaxeFlixel. It's a bit daunting because I'm so used to Unity, but hopefully I can get something working with it. I am looking forward to not struggling to get pixel art to look good, as is often the case in Unity.

Never mind, I had to change my security settings to allow apps downloaded from anywhere. Not sure why that's suddenly required considering I've run hundreds of Ludum Dare games in the past, but anyway...